Relevant bibliographies by topics / Brønsted acid/base

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Brønsted acid/base'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Brønsted acid/base"

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Tan, Choon-Hong, Bo Teng, and Wei Lim. "Recent Advances in Enantioselective Brønsted Base Organocatalytic Reactions." Synlett 28, no. 11 (2017): 1272–77. http://dx.doi.org/10.1055/s-0036-1588847.

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Enantioselective Brønsted base catalyzed reactions have established themselves as powerful tools for the construction of optically pure compounds. Most strategies aim at improving these reactions involve the modification of substrates to decrease the pK a of the acidic proton. Typically, an electron-withdrawing group such as an ester or a fluorine is placed at the α-carbon, where the proton is also residing. The activation of less active proton, thus, becomes a major challenge in this field of research. In order to overcome this pK a barrier, some new innovative approaches have been demonstrat
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Shen, Juan, and Choon-Hong Tan. "Brønsted-acid and Brønsted-base catalyzed Diels–Alder reactions." Organic & Biomolecular Chemistry 6, no. 18 (2008): 3229. http://dx.doi.org/10.1039/b809505c.

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Nuthakki, Bharathi, Tamar L. Greaves, Irena Krodkiewska, et al. "Protic Ionic Liquids and Ionicity." Australian Journal of Chemistry 60, no. 1 (2007): 21. http://dx.doi.org/10.1071/ch06363.

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Protic ionic liquids (PILs) are a subset of ionic liquids formed by the equimolar mixing of a Brønsted acid and a Brønsted base. PILs have been categorized as poor ionic liquids. However, the issue of assessing the ionicity of PILs is still a matter of debate. In this work we studied some physicochemical properties of three chosen PILs, namely, ethanolammonium acetate (EOAA), 2-methylbutylammonium formate (2MBAF), and pentylammonium formate (PeAF), at the initial equimolar (stoichiometric) acid/base ratio and in the presence of excess acid and base. DSC phase-transition studies along with NMR,
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Handa, Sachin, Sri S. Subramanium, Aaron A. Ruch, Joseph M. Tanski, and LeGrande M. Slaughter. "Ligand- and Brønsted acid/base-switchable reaction pathways in gold(i)-catalyzed cycloisomerizations of allenoic acids." Organic & Biomolecular Chemistry 13, no. 13 (2015): 3936–49. http://dx.doi.org/10.1039/c4ob02640c.

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Shelly, Kevin P., K. Nagarajan, and Ross Stewart. "Arylphosphonic acids. II. General acid and general base catalysis of acetone enolization." Canadian Journal of Chemistry 65, no. 8 (1987): 1734–38. http://dx.doi.org/10.1139/v87-291.

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We have measured the rate constants for the enolization of acetone catalyzed by 29 arylphosphonate dianions (ArPO32−) and by 20 arylphosphonic acids (ArPO3H2). An excellent Brønsted correlation is found for the former reaction, with most ortho substituted compounds falling on the line drawn for the meta and para compounds (β = 0.72). The largest deviation is found for o-iodo, whose small positive deviation is ascribed to a polarizability effect in the transition state. The arylphosphonic acids give a fairly good Brønsted plot (α = 0.37) but here the ortho substituents tend to react slightly fa
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Sodeoka, Mikiko, and Yoshitaka Hamashima. "Acid-base catalysis using chiral palladium complexes." Pure and Applied Chemistry 78, no. 2 (2006): 477–94. http://dx.doi.org/10.1351/pac200678020477.

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Chiral Pd aqua and µ-hydroxo complexes were found to act as mild Brønsted acids and bases, and chiral Pd enolates were generated from these complexes even under acidic conditions. Highly enantioselective Michael addition, Mannich-type reaction, fluorination, and conjugate addition of amines have been developed based on the acid-base character of these Pd complexes.
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Chhabra, Tripti, Ashish Bahuguna, Sandeep Singh Dhankhar, C. M. Nagaraja, and Venkata Krishnan. "Sulfonated graphitic carbon nitride as a highly selective and efficient heterogeneous catalyst for the conversion of biomass-derived saccharides to 5-hydroxymethylfurfural in green solvents." Green Chemistry 21, no. 21 (2019): 6012–26. http://dx.doi.org/10.1039/c9gc02120e.

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Sulfonated graphitic carbon nitride having both Brønsted base and Brønsted acid sites is used as a heterogeneous catalyst for the selective conversion of different biomass-derived saccharides to 5-hydroxymethylfurfural in green solvents.
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Ingleson, Michael, and Valerio Fasano. "Recent Advances in Water-Tolerance in Frustrated Lewis Pair Chemistry." Synthesis 50, no. 09 (2018): 1783–95. http://dx.doi.org/10.1055/s-0037-1609843.

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A water-tolerant frustrated Lewis pair (FLP) combines a sterically encumbered Lewis acid and Lewis base that in synergy are able to activate small molecules even in the presence of water. The main challenge introduced by water comes from its reversible coordination to the Lewis acid which causes a marked increase in the Brønsted acidity of water. Indeed, the oxophilic Lewis acids typically used in FLP chemistry form water adducts whose acidity can be comparable to that of strong Brønsted acids such as HCl, thus they can protonate the Lewis base component of the FLP. Irreversible proton transfe
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Wei, Wei, Rongjie Lu, Haojie Xie, et al. "Selective adsorption and separation of dyes from an aqueous solution on organic–inorganic hybrid cyclomatrix polyphosphazene submicro-spheres." Journal of Materials Chemistry A 3, no. 8 (2015): 4314–22. http://dx.doi.org/10.1039/c4ta06444e.

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Poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS) submicro-spheres were easily prepared, which exhibited a selective adsorption and separation of dyes that can be classified as Lewis acids and/or Brønsted acids by acid–base interactions.
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Catalán, Javier, and José Palomar. "Gas-phase protolysis between a neutral Brønsted acid and a neutral Brønsted base?" Chemical Physics Letters 293, no. 5-6 (1998): 511–14. http://dx.doi.org/10.1016/s0009-2614(98)00833-1.

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Dissertations / Theses on the topic "Brønsted acid/base"

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Lindsay, Anita Geraldine. "Mechanism-guided studies of Brønsted acid and base organocatalysis." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/314/.

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We have studied the mechanism of the reaction of N-Boc imines and acetylacetone in the presence and absence of chiral phosphoric acid catalysts. In order to gain mechanistic insight into the asymmetric Mannich reaction, a structurally homologous series of N-Boc imines and BINOL-derived phosphoric acid and thiophosphoric acid catalysts were synthesised. The degree of asymmetric catalysis was evaluated by chiral HPLC analysis of the products of catalysed Mannich reactions. Knowledge of the acidity difference between the phosphoric acid catalysts and the iminium ions is essential in order to dete
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Clot, Almenara Lidia. "Immobilization of Chiral Brønsted Acids and Lewis Bases for Batch and Flow Enantioselective Catalysis." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/552409.

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El següent treball, titulat “Immobilització d’àcids de Brønsted i bases de Lewis quirals per catàlisi asimètrica en batch i flux”, esta basat en el disseny de nous materials organocatalítics suportats i en la seva aplicació en reaccions asimètriques. La tesi presenta una discussió detallada de diverses rutes sintètiques per a la immobilització en poliestirè d’àcids de Brønsted i bases de Lewis. En particular, s’ha aconseguit optimitzar una ruta directa i efectiva per a la preparació d’àcids fosfòrics quirals (CPA) i N,N’-diòxids suportats en poliestirè (PS). Per a realitzar la immobilitzaci
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Chappaz, Alban. "Développement de nouveaux milieux et catalyseurs acides pour la transformation de biomasse lignocellulosique en molécules plateformes." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0936.

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L'objectif de la thèse est d'étudier la transformation de la fraction cellulosique de la biomasse en acide lévulinique. Cet acide est une molécule plateforme permettant un accès à de multiples produits, tels que des solvants, des monomères ou encore des molécules à plus forte valeur ajoutée.Nous proposons d'étudier la transformation de la cellulose en acide lévulinique catalysée par des solutions aqueuses concentrées en acides de Brønsted. La forte acidité de ces milieux et leur capacité à rompre les liaisons hydrogène de la cellulose rendent possible des réactions à température modérée (80°C)
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Pinheiro, Danielle Lobo Justo. "O uso de azalactonas em síntese orgânica: preparação, aplicação em reações de formação de ligação C-C e em síntese total." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/7551.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-09-27T15:51:52Z No. of bitstreams: 1 daniellelobojustopinheiro.pdf: 20180936 bytes, checksum: 98e45bb923da9d2234c5a70398868760 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-10-01T18:08:20Z (GMT) No. of bitstreams: 1 daniellelobojustopinheiro.pdf: 20180936 bytes, checksum: 98e45bb923da9d2234c5a70398868760 (MD5)<br>Made available in DSpace on 2018-10-01T18:08:20Z (GMT). No. of bitstreams: 1 daniellelobojustopinheiro.pdf: 20180936 bytes, checksum: 98e45bb923da9d2234c5a70398868760 (MD5
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Bunrit, Anon. "Direct Catalytic Nucleophilic Substitution of Non-Derivatized Alcohols." Doctoral thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-146426.

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This thesis focuses on the development of methods for the activation of the hydroxyl group in non-derivatized alcohols in substitution reactions. The thesis is divided into two parts, describing three different catalytic systems. The first part of the thesis (Chapter 2) describes nucleophilic allylation of amines with allylic alcohols, using a palladium catalyst to generate unsymmetrical diallylated amines. The corresponding amines were further transformed by a one-pot ring-closing metathesis and aromatization reaction to afford β-substituted pyrroles with linear and branched alkyl, benzyl, an
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Books on the topic "Brønsted acid/base"

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Maruoka, K., K. Nagasawa, Y. Sohtome, et al. Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00000.

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Book chapters on the topic "Brønsted acid/base"

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Hatano, Manabu, and Kazuaki Ishihara. "Brønsted Acid/Lewis Base Hybrid Complexes." In Topics in Organometallic Chemistry. Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_143.

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Atkins, Peter. "Civil Partnerships: Lewis Acid–Base Reactions." In Reactions. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199695126.003.0013.

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One of the most remarkable chemists of the twentieth century, Gilbert Lewis (1875–1946), who died in a rather peculiar event involving cyanide (which will figure further in this account) took the story of acids and bases that I described in Reaction 2, extended its reach, and thereby captured a further huge swathe of chemical countryside. As I remarked in that section, chemists seek patterns of behaviour, partly because it systematizes their subject but also because it gives insight into the molecular events accompanying a reaction. Lewis contributed greatly to this enlargement of chemistry’s vision, as I shall unfold in this section. I explained in Reaction 2 how Lowry and Brønsted had extended Arrhenius’s vision of acids and bases by proposing that all reactions between acids and bases involve the transfer of a proton (a hydrogen ion, H+) from the acid, the proton donor, to the base, the proton acceptor. For instance, hydrochloric acid, HCl, can provide a proton that sticks to an ammonia molecule, NH3, 1, converting it into NH4+, 2. The Lowry–Brønsted account of an acid–base reaction involves a proton as an essential part of the definition: if protons aren’t around, then Lowry and Brønsted are silent on whether a substance is an acid or a base. There are, however, many reactions that resemble acid–base reactions but in which no protons are transferred. I will give what might seem to be a rather esoteric example, but it makes the point in a simple and direct way, so please bear with me; you will soon see the relevance of this presentation to everyday life. The esoteric example I have in mind is a reaction in which a boron trifluoride molecule, BF3, 3, sticks to an ammonia molecule to form NH3BF3, 4. This reaction clearly resembles the proton transfer reaction in which H+ attaches to NH3 to form NH4+, but with BF3 playing the role of H+. Lewis brought these aspects together in a very simple idea in 1923, at about the same time as Lowry and Brønsted made their proposals. A base, he proposed, is any species that can use two of its electrons to attach to an incoming species.
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Singh, R. P., and L. Deng. "Asymmetric Brønsted Base Catalysis." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00058.

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Chen, Y. C., and H. L. Cui. "Brønsted Acid Catalyzed Cascade Reactions." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00598.

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Pápai, I. "Organocatalysis by Brønsted Bases." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00468.

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Pápai, I. "Organocatalysis by Chiral Brønsted Acids." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00471.

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Singh, R. P., and L. Deng. "Acid–Base Cooperative Catalysis." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00075.

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Hatakeyama, S. "Using Chiral Thioureas as Brønsted Acid Activators with Achiral Amine Nucleophiles." In Lewis Base and Acid Catalysts. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00336.

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Singh, R. P., and L. Deng. "Enantioselective Base Catalysis." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00057.

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Singh, R. P., and L. Deng. "Base–Iminium Catalysis." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00095.

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Conference papers on the topic "Brønsted acid/base"

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Guo, Hong, and Patricia Iglesias. "Tribological Properties of Ammonium Protic Ionic Liquids As Additives in Polyalphaolefin for Steel-Steel Contact." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10645.

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Abstract Around 23% of the world’s energy consumption results from rubbing contacts, in which 20% is used to overcome friction and 3% is due to wear and the consequent failure. The implementation of lubricants and effective lubricant additives are indispensable to reduce friction and wear of rubbing materials. Protic Ionic Liquids (PILs), which are easily obtained by proton transfer from a Brønsted acid to a Brønsted base, have shown great potential to be used as lubricants due to their structures and tunable properties. In this study, two kinds of novel PILs, bis(2-hydroxyethylammonium) succi
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Liliasari, S., E. Nursa’adah, and L. N. Amsad. "Describing Pre-service Chemistry Teachers’ Misconceptions of Proton Transfer in Acids-Bases Brønsted-Lowry." In 2nd Asian Education Symposium. SCITEPRESS - Science and Technology Publications, 2017. http://dx.doi.org/10.5220/0007301502190222.

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Tsukamoto, Yoshihisa, Takao Fukuma, and Jin Kusaka. "Analysis and Modeling of NOx Reduction Based on the Reactivity of Cu Active Sites and Brønsted Acid Sites in a Cu-Chabazite SCR Catalyst." In 14th International Conference on Engines & Vehicles. SAE International, 2019. http://dx.doi.org/10.4271/2019-24-0150.

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